Indeed, the problem is that it will be harder to distribute because not everyone has an arduino / hardware to plug it in so its easier with a button :). Still is a great idea!, I'll add that as optional and publish that arduino and the schematics :-)

I placed the Leap motion in the table because I get better tracking when I have the hands concave (like when you are modeling clay). I wanted to have the leap on the head!, and I even have the VR Mount! but I tried it on the very early stages of the development and the tracking was really bad :-(, to the point that I could only track my hands if I had them wide open, else the fingers will crook :(